How much do new windows cost?
New windows are priced per opening. Enter how many you need for a region-adjusted supply-and-fit estimate, then roll it into your schedule.
What affects window cost
- 1Count the openings
Price is per window. A typical 3-bed has roughly 8–10 windows.
- 2Size and style
Bays, large panes and specialist glass (obscure, toughened, acoustic) add cost.
- 3Frame material
uPVC is the value option; aluminium and timber cost more but suit certain properties/areas.
Windows are a classic value-add in a refurbishment — new A-rated units improve the EPC and the look, both of which support the end valuation on a flip or refinance.
New window costs (indicative, supply & fit)
| Type | Per window | Notes |
|---|---|---|
| uPVC casement (average) | £400 – £800 | A-rated double glazing |
| uPVC bay window | £1,000 – £1,800 | Larger, structural |
| Composite / aluminium | £700 – £1,500 | Premium frames |
| Whole 3-bed house (~8–10) | — | £3,500 – £7,000 |
Includes cills and making good. Timber and heritage windows cost more.
Frequently asked questions
How much does it cost to replace all the windows in a house?+
For a typical 3-bed with 8–10 windows, budget around £3,500–£7,000 for A-rated uPVC double glazing, supply and fit. Bays and premium frames add cost.
Do new windows need FENSA?+
Replacement windows must comply with Building Regs — usually via a FENSA/Certass-registered installer who self-certifies, or building control notification.
Related tools & guides
Want to know how these figures are calculated? See our cost methodology.
Cost figures shown are indicative estimates, not quotations. You are responsible for verifying all costs (obtain contractor quotes) and any figures submitted to a lender. ScopeWise is a documentation tool, not financial, tax, structural or planning advice. HMO compliance prompts are guidance only — confirm requirements with your local council, as standards and licensing vary by authority.